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【结 构 式】

【分子编号】47937

【品名】1,3-dichloro-5-isocyanatobenzene; 3,5-dichlorophenyl isocyanate

【CA登记号】

【 分 子 式 】C7H3Cl2NO

【 分 子 量 】188.01236

【元素组成】C 44.72% H 1.61% Cl 37.71% N 7.45% O 8.51%

与该中间体有关的原料药合成路线共 1 条

合成路线1

该中间体在本合成路线中的序号:(VII)

The reaction of N-(tert-butoxycarbonyl)-L-alanine (I) with benzaldehyde dimethylacetal (II) by means of SOCl2 and ZnCl2 gives the oxazolidinone (III), which is alkylated with 4-bromobenzyl bromide (IV) and KHMDS in THF to yield the alkylated compound (V). The opening of the oxazolidinone ring of (V) with HBr/HOAc, followed by esterification with EtOH/HCl, affords the aminopropionic ester (VI), which is cyclized again with 3,5-dichlorophenyl isocyanate (VII) by means of Na2CO3 to provide imidazolidinedione (VIII). Finally, this compound is methylated with Me-I and NaHMDS to give the target compound.

1 Kapadia, S.R.; et al.; An improved synthesis of chiral alpha-(4-bromobenzyl)alanine ethyl ester and its application to the synthesis of LFA-1 antagonist BIRT-377. J Org Chem 2001, 66, 5, 1903.
2 Emeigh, J.E.; et al.; Small molecule antagonists of LFA-1 mediated cell adhesion. 221st ACS Natl Meet (April 1 2001, San Diego) 2001, Abst MEDI 256.
3 Bormann, B.J.; Frye, L.L.; Wu, J.-P.; Kelly, T.A. (Boehringer Ingelheim Pharmaceuticals Inc.); Small molecules useful in the treatment of inflammatory disease. EP 0966447; WO 9839303 .
中间体序号 中间体编号 品名 CAS号 分子式 供应商 用于合成
(I) 26450 Boc-L-Alanine;(S)-2-((tert-butoxycarbonyl)amino)propanoic acid;N-Boc-L-alanine; (2S)-2-[(tert-butoxycarbonyl)amino]propionic acid 15761-38-3 C8H15NO4 详情 详情
(II) 27515 Methoxy(phenyl)methyl methyl ether; Dimethylacetal benzaldehyde; Benzaldehyde dimethylacetal 1125-88-8 C9H12O2 详情 详情
(III) 47934 tert-butyl (2S,4S)-4-methyl-5-oxo-2-phenyl-1,3-oxazolidine-3-carboxylate C15H19NO4 详情 详情
(IV) 16109 1-bromo-4-(bromomethyl)benzene; 4-Bromobenzyl bromide 589-15-1 C7H6Br2 详情 详情
(V) 47935 tert-butyl (2S,4S)-4-(4-bromobenzyl)-4-methyl-5-oxo-2-phenyl-1,3-oxazolidine-3-carboxylate C22H24BrNO4 详情 详情
(VI) 47936 ethyl (2S)-2-amino-3-(4-bromophenyl)-2-methylpropanoate C12H16BrNO2 详情 详情
(VII) 47937 1,3-dichloro-5-isocyanatobenzene; 3,5-dichlorophenyl isocyanate C7H3Cl2NO 详情 详情
(VIII) 47933 (5R)-5-(4-bromobenzyl)-3-(3,5-dichlorophenyl)-5-methyl-2,4-imidazolidinedione C17H13BrCl2N2O2 详情 详情
Extended Information